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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
- * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
- */
- #include <common.h>
- #include <dm.h>
- #include <dm/pinctrl.h>
- #include <dt-bindings/pinctrl/sandbox-pinmux.h>
- #include <log.h>
- #include <linux/bitops.h>
- /*
- * This driver emulates a pin controller with the following rules:
- * - The pinctrl config for each pin must be set individually
- * - The first three pins (P0-P2) must be muxed as a group
- * - The next two pins (P3-P4) must be muxed as a group
- * - The last four pins (P5-P8) must be muxed individually
- */
- static const char * const sandbox_pins[] = {
- #define PIN(x) \
- [x] = "P" #x
- PIN(0),
- PIN(1),
- PIN(2),
- PIN(3),
- PIN(4),
- PIN(5),
- PIN(6),
- PIN(7),
- PIN(8),
- #undef PIN
- };
- static const char * const sandbox_pins_muxing[][2] = {
- { "UART TX", "I2C SCL" },
- { "UART RX", "I2C SDA" },
- { "SPI SCLK", "I2S SCK" },
- { "SPI MOSI", "I2S SD" },
- { "SPI MISO", "I2S WS" },
- { "GPIO0", "SPI CS0" },
- { "GPIO1", "SPI CS1" },
- { "GPIO2", "PWM0" },
- { "GPIO3", "PWM1" },
- };
- #define SANDBOX_GROUP_I2C_UART 0
- #define SANDBOX_GROUP_SPI_I2S 1
- static const char * const sandbox_groups[] = {
- [SANDBOX_GROUP_I2C_UART] = "I2C_UART",
- [SANDBOX_GROUP_SPI_I2S] = "SPI_I2S",
- };
- static const char * const sandbox_functions[] = {
- #define FUNC(id) \
- [SANDBOX_PINMUX_##id] = #id
- FUNC(UART),
- FUNC(I2C),
- FUNC(SPI),
- FUNC(I2S),
- FUNC(GPIO),
- FUNC(CS),
- FUNC(PWM),
- #undef FUNC
- };
- static const struct pinconf_param sandbox_conf_params[] = {
- { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
- { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
- { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
- { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
- { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
- { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
- { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
- { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
- { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
- { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
- { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
- };
- /* Bitfield used to save param and value of each pin/selector */
- struct sandbox_pinctrl_priv {
- unsigned int mux;
- unsigned int pins_param[ARRAY_SIZE(sandbox_pins)];
- unsigned int pins_value[ARRAY_SIZE(sandbox_pins)];
- };
- static int sandbox_get_pins_count(struct udevice *dev)
- {
- return ARRAY_SIZE(sandbox_pins);
- }
- static const char *sandbox_get_pin_name(struct udevice *dev, unsigned selector)
- {
- return sandbox_pins[selector];
- }
- static int sandbox_get_pin_muxing(struct udevice *dev,
- unsigned int selector,
- char *buf, int size)
- {
- const struct pinconf_param *p;
- struct sandbox_pinctrl_priv *priv = dev_get_priv(dev);
- int i;
- snprintf(buf, size, "%s",
- sandbox_pins_muxing[selector][!!(priv->mux & BIT(selector))]);
- if (priv->pins_param[selector]) {
- for (i = 0, p = sandbox_conf_params;
- i < ARRAY_SIZE(sandbox_conf_params);
- i++, p++) {
- if ((priv->pins_param[selector] & BIT(p->param)) &&
- (!!(priv->pins_value[selector] & BIT(p->param)) ==
- p->default_value)) {
- strncat(buf, " ", size);
- strncat(buf, p->property, size);
- }
- }
- }
- strncat(buf, ".", size);
- return 0;
- }
- static int sandbox_get_groups_count(struct udevice *dev)
- {
- return ARRAY_SIZE(sandbox_groups);
- }
- static const char *sandbox_get_group_name(struct udevice *dev,
- unsigned selector)
- {
- return sandbox_groups[selector];
- }
- static int sandbox_get_functions_count(struct udevice *dev)
- {
- return ARRAY_SIZE(sandbox_functions);
- }
- static const char *sandbox_get_function_name(struct udevice *dev,
- unsigned selector)
- {
- return sandbox_functions[selector];
- }
- static int sandbox_pinmux_set(struct udevice *dev, unsigned pin_selector,
- unsigned func_selector)
- {
- int mux;
- struct sandbox_pinctrl_priv *priv = dev_get_priv(dev);
- debug("sandbox pinmux: pin = %d (%s), function = %d (%s)\n",
- pin_selector, sandbox_get_pin_name(dev, pin_selector),
- func_selector, sandbox_get_function_name(dev, func_selector));
- if (pin_selector < 5)
- return -EINVAL;
- switch (func_selector) {
- case SANDBOX_PINMUX_GPIO:
- mux = 0;
- break;
- case SANDBOX_PINMUX_CS:
- case SANDBOX_PINMUX_PWM:
- mux = BIT(pin_selector);
- break;
- default:
- return -EINVAL;
- }
- priv->mux &= ~BIT(pin_selector);
- priv->mux |= mux;
- priv->pins_param[pin_selector] = 0;
- priv->pins_value[pin_selector] = 0;
- return 0;
- }
- static int sandbox_pinmux_group_set(struct udevice *dev,
- unsigned group_selector,
- unsigned func_selector)
- {
- bool mux;
- int i, group_start, group_end;
- struct sandbox_pinctrl_priv *priv = dev_get_priv(dev);
- unsigned int mask;
- debug("sandbox pinmux: group = %d (%s), function = %d (%s)\n",
- group_selector, sandbox_get_group_name(dev, group_selector),
- func_selector, sandbox_get_function_name(dev, func_selector));
- if (group_selector == SANDBOX_GROUP_I2C_UART) {
- group_start = 0;
- group_end = 1;
- if (func_selector == SANDBOX_PINMUX_UART)
- mux = false;
- else if (func_selector == SANDBOX_PINMUX_I2C)
- mux = true;
- else
- return -EINVAL;
- } else if (group_selector == SANDBOX_GROUP_SPI_I2S) {
- group_start = 2;
- group_end = 4;
- if (func_selector == SANDBOX_PINMUX_SPI)
- mux = false;
- else if (func_selector == SANDBOX_PINMUX_I2S)
- mux = true;
- else
- return -EINVAL;
- } else {
- return -EINVAL;
- }
- mask = GENMASK(group_end, group_start);
- priv->mux &= ~mask;
- priv->mux |= mux ? mask : 0;
- for (i = group_start; i < group_end; i++) {
- priv->pins_param[i] = 0;
- priv->pins_value[i] = 0;
- }
- return 0;
- }
- static int sandbox_pinmux_property_set(struct udevice *dev, u32 pinmux_group)
- {
- int ret;
- unsigned pin_selector = pinmux_group & 0xFFFF;
- unsigned func_selector = pinmux_group >> 16;
- ret = sandbox_pinmux_set(dev, pin_selector, func_selector);
- return ret ? ret : pin_selector;
- }
- static int sandbox_pinconf_set(struct udevice *dev, unsigned pin_selector,
- unsigned param, unsigned argument)
- {
- struct sandbox_pinctrl_priv *priv = dev_get_priv(dev);
- debug("sandbox pinconf: pin = %d (%s), param = %d, arg = %d\n",
- pin_selector, sandbox_get_pin_name(dev, pin_selector),
- param, argument);
- priv->pins_param[pin_selector] |= BIT(param);
- if (argument)
- priv->pins_value[pin_selector] |= BIT(param);
- else
- priv->pins_value[pin_selector] &= ~BIT(param);
- return 0;
- }
- static int sandbox_pinconf_group_set(struct udevice *dev,
- unsigned group_selector,
- unsigned param, unsigned argument)
- {
- debug("sandbox pinconf: group = %d (%s), param = %d, arg = %d\n",
- group_selector, sandbox_get_group_name(dev, group_selector),
- param, argument);
- return 0;
- }
- const struct pinctrl_ops sandbox_pinctrl_ops = {
- .get_pins_count = sandbox_get_pins_count,
- .get_pin_name = sandbox_get_pin_name,
- .get_pin_muxing = sandbox_get_pin_muxing,
- .get_groups_count = sandbox_get_groups_count,
- .get_group_name = sandbox_get_group_name,
- .get_functions_count = sandbox_get_functions_count,
- .get_function_name = sandbox_get_function_name,
- .pinmux_set = sandbox_pinmux_set,
- .pinmux_group_set = sandbox_pinmux_group_set,
- .pinmux_property_set = sandbox_pinmux_property_set,
- .pinconf_num_params = ARRAY_SIZE(sandbox_conf_params),
- .pinconf_params = sandbox_conf_params,
- .pinconf_set = sandbox_pinconf_set,
- .pinconf_group_set = sandbox_pinconf_group_set,
- .set_state = pinctrl_generic_set_state,
- };
- static const struct udevice_id sandbox_pinctrl_match[] = {
- { .compatible = "sandbox,pinctrl" },
- { /* sentinel */ }
- };
- U_BOOT_DRIVER(sandbox_pinctrl) = {
- .name = "sandbox_pinctrl",
- .id = UCLASS_PINCTRL,
- .of_match = sandbox_pinctrl_match,
- .priv_auto = sizeof(struct sandbox_pinctrl_priv),
- .ops = &sandbox_pinctrl_ops,
- };
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